Step stool



FIG. 1 is a perspective view of a step stool in an unfolded configuration;

FIG. 2 is a front view of the step stool illustrated in FIG. 1;

FIG. 3 is a rear view of the step stool illustrated in FIG. 1;

FIG. 4 is a first side view of the step stool illustrated in FIG. 1;

FIG. 5 is a second side view of the step stool illustrated in FIG. 1;

FIG. 6 is a top view of the step stool illustrated in FIG. 1;

FIG. 7 is a bottom of the step stool illustrated in FIG. 1;

FIG. 8 is a side view of the step stool illustrated in FIG. 1, in a folded configuration;

FIG. 9 is a front view of the folded step stool illustrated in FIG. 8; and,

FIG. 10 is a rear view of the folded step stool illustrated in FIG. 8.

The broken lines in the drawings depict portions of the step stool that form no part of the claimed design. 

CLAIM The ornamental design for a step stool, as shown and described. 